fair-haired boy
fair-haired boy {n.}, {informal}
A person that gets special favors; favorite; pet.
If he wins the election by a large majority, he will become his party's fair-haired boy.
The local boy playing first base could do no wrong; he was the fair-haired boy of the fans.
Charles was a good student and behaved very well; he became the teacher's fair-haired boy.
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Source: A Dictionary of American Idioms